David Cameron faced an awkward diplomatic encounter with Turkey’s prime minister Ahmet Davutoğlu last night as he promised to share high-level intelligence on Islamic State fighters but his counterpart hit out at foreign “propaganda” about them passing through Turkish territory.

US vice-presidential candidates Joe Biden and Paul Ryan are preparing for their televised debate on Thursday with the knowledge that a strong performance during the head-to-head from Republican presidential candidate Mitt Romney has closed the gap with President Obama to just two points.